Buffering device for machine-guns.



v. v. DlBOV -SK Y. BUFFERING DEVICE FOR MACH INE GUNS.

APPLICATION FILED' APR. 10. I918.

Patented Apr. 1, 1919.

P VICTOR V. DIBOVSKY, OF KINGSWAY, LONDON, ENGLAND.

BUFFERING DEVICE FOR MACHINE-GUNS.

Specification of Letters Patent.

Patented Apr. 1, 1919.

Application filed April 10, 1918. Serial N 0. 227,776.

To all whom it may concern Be it known that I, VICTOR VLADIMIRO- vIroH DIBOVSKY, a Russian subject, captain of the Russian naval general stafi, and whose post-office address is Canada House, Kingsway, London, England, have invented certain new and useful Improvements in Buffering Dtvices for Machine-Guns, of which the following is a specification.

This invention relates to buffering devices for machine guns.

The rate of fire of an automatic gun can be increased by increasing the rate of reciprocation of the breech-block and other parts cooperating therewith. If the said rate of reciprocation is increased, disadvantages arise because the degree of shock imposed on the gun-mechanism is increased as well as its liability to jam. It is to a buffering device for use in the mechanism of a high-speed machine-gun, to counteract these disadvantages, that-the present invention relates; the improvements thereunder are applicable to guns that are at present in use without necessitating alteration in the existing parts thereof, as well as to guns modified in design to incorporate the improvements.

The principal feature of the present invention is that in guns which comprise a crank-shaft there is provided at one or at each of the ends of that crank-shaft vav spring and a fusee, the latter so disposed in relation to that spring that the leverage of the fusee shall increase as the crank moves toward that end of its path toward which it is impelled by the recoiling lock. Where the automatic gun already has a fuseespring operating upon a fusee so that the leverage exerted against the fusee by the spring diminishes as the crank moves back, it is only necessary to re-arrange the fusee in relation to the spring so that the contrary effect is produced.

Preferably if the gun is a Vickers gun the existing fusee-spring eccentric is thus altered at one end of the shaft and a similarly acting fusee and spring are applied tothe opposite end of the same shaft, the two springs and their fusees thus cooperating to check the rapidity of the recoil and increase the rapidity of return.

The invention is hereinafter described in its application to a Vickers gun of a type already well-known and firing small-arm ammunition.

In the accompanying drawings Figure l is a side elevation, partly in section, and v Fig. 2 a plan of the rear end of a gun with fusees and springs applied to the weapon in the manner hereinafter explained.

In these figures the spring 1 is secured at its forward end by adjusting devices of any convenient type such as the screw A to a lug L attached to the gun-casing; at its end remote from the lug it is connected by a chain C to a fusee or eccentric E fixed to the crank-shaft CS in such relation to the main crank C of the gun, spring 1 and chain C that the leverage exerted against the fusee E by the spring 1 shall increase as the crank C approaches that end of the path toward which it is impelled by the recoiling lock, that is to say, viewin Fig. 1, as the crank-handle CH moves from the right in the figure toward the left.

At the, left-hand side of the gun is a spring 1' similar to the spring 1. The spring l may be the original recoil-spring of the Vickers gun, but according to the present invention it is connected to an eccentric E or fusee, fixed to the left-hand end of the crank-shaft in such relation to the crank C and spring l that the action of the eccentric E like that of the eccentric E, increases in opposition to the spring l as the lock approaches the extreme of its recoil movement. Thus the springs 1, 1 and their eccentrics E, E may be regarded as two parts of a mechanism which operate in parallel and simultaneously co-act for the same purpose, namely that of satisfactorily checking the termination of a rapid recoil, and rapidly initiating the return movement.

It is to be understood that though the springs 1 and l have been described as being in tension, springs in compression can be substituted in the manner well understood by engineers to give effects equivalent to those which are given by the afore said tension springs.

What I claim as my invention and desire to secure by Letters Patent is 1. In an automatic machine gun including a crank that is rocked at each firin operation, the combination with the cr of a spring, and connections between the spring and crank adapted to act with gradually increasing leverage on the crank during recoil of the gun and oppositely during the return movement, whereby the initial return of the crank and connected parts to firing position will be accelerated.

2. In an automatic machine gun including a crank that is rocked at each firing operation, the combination with the crank, of two springs arranged at opposite sides of the gun rand both connected to the crank by means adapted to act With gradually increasing leverage on the crank during recoil of the gun and to accelerate the initial return movement of thecrank toward firing position. a v

.In an vautomatic machinegun including Copies of this patentjznay belob'cained for a crank that is rocked at each firingopera tion, the combination with the crank, of a fusee' secured on one end of the crank,

and a spring having its end-s respectively a I v. nIBovs Y, Y

five cents eacligby addressing the f0bmmissionerbf Patents, 7 Washington, D. 0.

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